Update change log and spec for wrt-plugins-tizen_0.2.70

Update change log and spec for wrt-plugins-tizen_0.2.70

Changed Modules : MediaContent, Application, Device and SystemInfo

[Version] 0.2.70
[Project] GT-I8800, Public
[Title] Bug fix on MediaContent, Application, Device and SystemInfo
[Team] WebAPI
[BinType] PDA
[Customer] Open

[Issue#] N_SE-1229, N_SE-7294, N_SE-7296
[Problem] MediaContent - when the title search, the search results not.
[Cause] The Image Type, title column is empty.
[Solution] including file name condition to the sql statement.

[Issue#] N/A
[Problem] ApplicationInformation shows wrong installDate and size
[Cause] Bug
[Solution] Fix bug

[Issue#] N/A
[Problem] change capi-system-info Key name & modify UNIT TC code
[Cause] change capi-system-info Key name & added DeviceOrientation
Property
[Solution] chanage src code & unit tc code

[SCMRequest] N/A